Sahih Muslim 2719
صحيح مسلم#2719SahihAbdullah b. Shaqiq reported. I asked 'A'isha (Allah be pleased with her) about fasting of the Messenger of Allah (ﷺ). She said:He used to observe fast (at times) so continuously that we said: He has fasted, he has fasted. And (at times) he did not observe fast (for days) and we began to say: He has abandoned fasting, he has abandoned fasting. She said: I did not see him observing fast throughout the whole of the month since he arrived in Medina, but that of Ramadan
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:225